can someone please help whats this

hello everyone im growing in coco can someone please help me and tell me what this is im lead to believe it is cal mag deficiency but a second opinion would be great thanks in advance

im not up to date on coco, but it looks like a nitrogen deficancy.what are you feeding them and how offten?

Hey man need more info, how close is your light, what is your nuits, ect, ect...

I'm using the canna brand nutes a and b im using a litre of water with nutes e.c of 0.7 im using a 250w hps about 12inches away from tops of the plant im feeding daily

I'm not familiar with the canna a/b, but IMO if you have a true 250w HPS at 12 inches them
being that small probably a little light burn place you hand over them about 2 inches above
them and see if you feel the heat from the light, if you do its to close...

Are you feeding daily to substantial run off?
Do you give plain water?
What is your pH going in?
Do you let it dry out?

MickFoster said:

Are you feeding daily to substantial run off?
Do you give plain water?
What is your pH going in?
Do you let it dry out?

Click to expand...

originally I wasn't doing run off daily because the pot it was in is massive
no plain water
ph of 6
and no drying out